First lap pace and total average pace not matching

Hi, was wondering if anyone else has experienced this. It didn’t used to do this but has now started to sometimes do it with my FR255. I start a running activity and my data screen includes lap pace and total average pace. On some runs I do, I start the watch and the lap pace is different to the total average pace even though I’m on the first lap Rofl can be about 4-6 seconds out, sometimes more. If I press pause and then start then the lap pace then changes to match the total pace, so I’d say it’s the lap pace that is out. The photo below is on lap 1. Anyone else had this? Thanks