Running IOS18.5 Beta on iPhone 16 Pro Max

I'm running IOS 18.5 on my iPhone 16 Pro Max. If I delete an email on my iPhone, it is still in the inbox on my iMac. If I delete an email on my iMac it is deleted from the inbox on my iPhone. Is this because of the Beta software on my phone?

Running IOS18.5 Beta on iPhone 16 Pro Max
 
 
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