unable to remove payment method from account with transactions in progress

I am unable to remove payment method from billing. it says: unable to remove payment method from account with transactions in progress. I can see that one domain which is in free plan shows active subscription:

Active Subscriptions
Billing: Processing
Free plan

why my free plan shows to have an active subscription. this is happening only in the case of one particular domain, whereas other domains which are on free plan doesnot show active subscription.
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