This sort of stuff can happen when certificates get renewed, but this is not the case here:

Issuer Name
Country
US
Organization
Let's Encrypt
Common Name
R12
Validity
Not Before
Sun, 22 Feb 2026 17:35:49 GMT
Not After
Sat, 23 May 2026 17:35:48 GMT
Subject Alt Names
DNS Name
gimp.org
DNS Name
www.gimp.org