Why is my IPad appearing as Mac OS/new device on online account sign-ons

My (personal) iPad is strangely registering as Mac OS / new device when I sign into some accounts. This has been flagged as a security issue on several of my online accounts. I do not have any remote management software or company management software on my iPad, at least to my knowledge (nor has the iPad been out if my control.) Has anyone else experienced this issue?