You are going to end up with a rebuilt reserve month with ~9 days of reserve.

You need to call like 130J said and specifically find out about sliding the vacation AFTER you've already used a portion to remove the carryover R-days.

Something makes me think you can't slide it after you use it, but I don't remember the details of why I couldn't slide a vacation in a similar situation. It was a couple of years ago for me.