Paypal emails appear to be on an approximately 2-hour tape delay cycle. As for Sellers Hub, keep seeing offers/email messages after the fact compared to what's either arriving in my normal email or the bell icon and have already properly acknowledged as required. Sellers Hub, in my opinion, has never seemed to behave in real time OR with correct and accurate information as a standard feature.
-CM
PS. Shippo Invoice and Payment emails are also approximately 2 hours apart vs arriving one after the other as they did in the past. Hopefully, just another temporary glitch. Fingers crossed.