eseq speed issue

[info@trans-mission.tv]

Hi all, 
I have some simple effect that fade a light up and down over 15secs.
When I export the effect out of xlights and play it on FPP effects it takes 30secs rather than 15secs.
When I export the fseq file and trigger that as an effect in fpp it plays the correct time.
Has anyone else seen this issue, and if not give me an idea whhat mioght be going on.
Thanks
Steve

[dkulp]

I believe eseq files have to be 50ms timing.   Not 100% sure on that.