- You may be using a VPN, private browser or some other anonymised means of surfing the web.
- You may be logging in from different devices at times.
- Your IP address may change often; this is because your ISP will have a range of IP addresses, and the address will change without your even knowing.
- It might be eBay glitches.
Unless the messages indicate a log-in that is definitely not you, it should not be a matter for concern. Of course, it does pay to have a strong password that is unique to your eBay account. (Every password should be unique and strong.) Change it if you have concerns.
