I have always broken in my gloves with oil and practice. I decided to hurry this one along by using the suggested oven tip I have heard about in the past. “Oh, just put your glove in the oven!” I never believed them, because I feared it would catch fire. I thought I was wrong. My Easter was ruined today.
Edit: Here is the link that says 15 minutes at 350F: https://ecosports.com/blogs/vegan-athletes/how-to-break-in-a-baseball-glove
Betting it’s not leather. Leather doesn’t melt. It will burn, but never liquify. It clearly appears that the outer layer liquified. Also this screams prank to me, but good quality, oiled leather should also hold up ok to 350 for 15 mins.