Odd Breastfeeding question

My little guy is 5 and half months old and we’re breastfeeding. The last few days, more times than not, When he nurses there’s milk running out of the nostril that’s on the side he’s laying on. It’s different than when he’s spit up and milk comes out if his nose. This is while he is actually eating. I called his docs office on Friday and asked nurse about it and she said “hmm that’s odd” and that if it continues to let her know and she will ask the doctor about it. Anyone experienced this or know why it’s happening all of a sudden? TIA for any insight! Here’s my cutie pie!