Location services, in find my iPhone.

I recently lost my phone, it was switched off when I lost it but had plenty battery, I checked on iCloud through the find my at first, and did all the usual. The 24 hour period of last location disappeared. I then around 3/4 days later went onto my iPhone and went onto the find my app and noticed it was displaying my last location on there… even though on iCloud it stated the phone was offline which it still does and even did whilst my phone app was displaying a last location.. it’s kept saying “last seen 5 minutes” and then would come back on. 5mins/7mins and even went to aslong as 15 mins. Since that time period and that day, it doesn’t occur anymore. Im trying to figure out if some one was using my phone and is this even possible for find my to display a last location 2 times after the 24 hour period is this was a simple case of the two apps attempting there job at different time rates? As surely after the 24hour period this wouldn’t happen again. Does this mean since then the device had moved location? Or is this because of nearby apple devices interacting with the find my, there ford displaying my last location