I've never experienced this. Occasionally at the timing point before the DRS zone or the one in the DRS straight it might say a few hundredths either side of the 1 second trigger but this is misleading because the DRS activation line is not demarcated on the track nor is it coincident with a sector timing point.
You're L27 so I assume you realise that backmarkers can also activate DRS.
Ideally you should record your races and when you next experience this you can upload to a video hosting site and send me or another Mod a link for review.