There is nothing about the Mop Up round of BAMS programme in Maharashtra officially, But the seats vacant after the completion of 5th round and the seats which will be newly added as per the newly received permission of Government of India will be filled. You can check the information further about with the given below link.

https://www.dmer.org/new/Notice%20No.%2027%20-%2003.10.18.pdf

Good Luck!