There are a few possibilities, usually with no trust, the only way to break blocks is /siege (which cannot be done on a claim while the owner or a trusted player in the claim is not online), and that’s only some blocks. Maybe you trusted someone who did it, or didn’t claim it at all? I doubt someone wouldn’t claim their base base though so it might be just trusting someone who did it or not properly claiming, check /trustlist in the claim when you can, and if possible next time people need access to your claim either trust them temporarily or use /accesstrust (levers, buttons, trapdoors, etc. only), also might want to extend the claim (/extendclaim). Other than anything with the claim and /trust though i can’t really guess about anything else.