It’s the new update to the animation system. Its phase 2 was rolled out recently and everyone’s games have been affected. You can temporarily disable the changes by switching workspace.AnimationWeightedBlendFix to disabled, however once phase 3 rolls out, the property will be hidden and forced to be enabled.
If you have a lot of animations playing at the same time, have fun trying to find a solution. A lot of people like you are having the exact same issue and are complaining on Roblox post, although I highly doubt Roblox will revert the changes anytime soon.
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