same mac address for 2 different Clients in ARP table

[fawzy46]

hi guys, today I faced a really strange problem, my android Phone suddenly lost connection I couldn't ping my LAN but I could ping other devices on my LAN after an hour of digging around I found that 2 different devices are having the same mac address on ARP table (my laptop and my phone) the reported MAC address was actually my Laptop's Mac so ARP table reported the wrong MAC address for my Phone. but when I checked The DHCP Lease of my Phone the MAC address was reported correctly. so Does anyone has any idea about what can cause such a problem?