Oanda - Limit order symptom?

I understand Oanda increases their spreads during news events -- no big deal. What I'm wondering about is the attached image. The current price is past my TP level, after the spread returned to 2 pips (down from 10). My order was eventually closed, credited to my TP level (historical view option has my TP executed during the first 10 seconds after the news hit). Is this because:

A) Lag between my order being filled and the message being sent to my client that my order was filled caused the order to not disappear from my client window for a length of time, even though it was already closed on the server
B) The TP order is a limit order, which guarantees price, not execution. During NFP, price gapped over my TP order, and only upon coming back down to the TP level was the order filled. (This would conflict with what shows looking back on the 10 second chart with "show historical trades and orders" checked)
C) Other

I'm not complaining or anything, I could just see two possibilities and would like to know which is true or if it is something else entirely. The same thing happened with an E/U long at the same time (except it went past the SL level), but I didn't get a screen shot.

Many times it happened to Me, TP or SL was hit (I advise You to use ask and bid prices, not average pr.), but some seconds it still show the red/green line. But the trade was always executed properly.
PH

Thanks for your experience. The chart posted is a bid chart.

from my personal experience, A.

I've seen that happen often. The stop or TP will actually fill, but the the chart doesn't show it. In the case of a stoploss, account balance appears to keep dropping, even though the stoploss has been filled (though the lines on the chart remain). In the case of a TP, account balance appears to keep rising. If you try to close it manually, a window pops up stating that the order has already been closed. When it finally does close (visually), it will be at the correct price and account balance will reflect the correct balance--the balance determined by the original order closing at the correct price. At least that's my experience.

Oanda is less buggy if you open it from your desktop instead of your browser.

Thanks guys for your input! It sounds like we can blame technology for this one. I did open the client from the beta.jnlp FX Desktop file, although it had been running for ~8 hours at that point -- no big deal.

Final question: has anyone ever had a client show a margin call in this scenario? If so, was your balance returned to a proper state after the transaction showed closed? If one believed Oanda was a "nefarious broker," I could see them respecting SL/TP in all cases except for a situation where they gained a large amount of funds margin calling an account and then blaming it on a SL not being filled due to market liquidity, when in the past all SLs during news had been more or less respected.

FWIW, I'm not trying to trade the news; I just want to be able to hold onto positions that may not be closed out yet during news time.

I think this is an intended delay in reporting the execution to the client platform, to counter the very fast scalpers. I remember some years ago this topic was already addressed here on FF.