Steps to reproduce:

1. Set up uptime graph for hosts
2. Hover mouse over graph
3. compare values shown in the hover box with latest data
4. see completely different values

Result:

~21 days for rpi41,rpi42,rpi43,rpi44 hosts in latest data

vs

2hours in on-hover box for rpi41

0 hours in on-hover box for rpi42

8 days for rpi43 and rpi44 in on-hover box

Expected:
See screenshot....
See attached patch file...