ID:1506563
 
Resolved
Animations with pixel offsets didn't behave properly.
BYOND Version:504
Operating System:Windows XP Pro
Web Browser:Chrome 33.0.1750.117
Applies to:Dream Seeker
Status: Resolved (506.1236)

This issue has been resolved.
Descriptive Problem Summary:

My particles seem to be starting from strange positions, far away from their supposed origin.

Numbered Steps to Reproduce Problem:

The effect is noticeable in the same test project I made earlier (download)

I guess this has been happening since 1227. 1226 is the latest version I could find that does not have the bug.
Lummox JR resolved issue with message:
Animations with pixel offsets didn't behave properly.