bg readings after one hour

Hi just a quick question please I took my reading before tea it was 5.1 , i dont usually test after one hour but tonight i did as i had 5 thick cut oven chips with my tea its the first time ive had these since before diagnosis my reading after a hour was 10.5 i re tested after another hour and it had gone down to 6.1 is this ok as long as its gone down after the 2 hours ? or should i aviod the oven chips in future? i had a portion of kfc chips over xmas and they didnt effect me at all :shock:

Thanks for your replies i was a bit worried