Technically, its the case, i.e., the certificate issued in February,2022 must be valid till 31st  March,2022 . Now as your certificate shows that its valid for 2022-23 it can be a mistake or may not be a mistake. I would recommend you to contact the issuing authority and get it discussed, they will guide you out and if required will issue a new one.

Also, for most of the examinations, in the official brochure the date of issue is provided. For example, in IIT JAM 2022, the conducting authorities have asked for the certificate issued after 31st March,2022. So for your case also, I would recommend you to check the eligibility of a valid certificate. The brochure you will get in the official website of the examination.

I hope this helps.