I'm looking at my profile page and my Arcade account is at 449 rep, 10 more rep than yesterday at 439 rep:
But when I go to Arcade itself, it says I only have 439 reputation. When going to the reputation tab, the last time I had a rep change was March 25 with a +10, sending my rep to 439 rep:
So what caused my sudden rep change here? There was no downvotes on answers or removed posts or users.