Not necessary but it can be one of the reasons. Try to move Your palm a bit left. Remember to always keep the soft part of a palm with the strings when You palm mute.
More reasons are
1. Type of the tone
2. Type of guitar
3. Pick angle
4. Pick thickness (my thin pick give extra amount of "percussive" flavour. That one of many reasons I use those instead of thick ones. But this is just a tip...no a must
Can You post a vid of your best possible palm muting tone and similar cam angle to clearly see the right hand? Just like You did in previous posts?
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