[MlMt] moving between google accounts does not delete from source?

[Paula R. T. Coelho]

hello,

i’m using MM to move thousands of messages from one account to another 
(both google), with “Move to Mailbox…”.

the intention is to remove the messages from the source account, but the 
messages keep reappearing. Labels are removed, so they show up in All 
Mail.

is this on purpose? or?

thanks,
Paula