SNMP changing on link down/up

Hello everyone,

I am using PRTG to monitor my network and its devices.
One thing I noticed is that my VPN interface from mikrotik, whenever I get a link down and then it comes back up, even though that it’s the same interface, PRTG is unable to keep tracking of it’s information,
It’s as if the OIDs were different per connection and not per interface.

Is this a bug? Am I seeing this wrong?

Edit: Missing what’s important. RB3011 + v6.37rc20