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Because you are using a round over bit it will try a lift the MDF up when the cut is made.
You can make a hold down device to hold it down to the base plate when you push it over the bit.
You can check the base plate with a flat ruler but I don't think that's it.
Most round over bits have a bearning on top, make sure it's true to the fence or to say best shy than proud.

Have a good weekend

Bj :)
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