icons damaged

Hi,
I use WebMan Amplifier with the Mustang Lite theme. it was working great until last night when i took the backup using the WP-All-in-one-Migration plugin and restored the backup to a new domain name. I have used WP-All-in-one-Migration plugin many times with other themes and plugins and never got such issue so i dont think the backup has any corruption. apart from it, i took 3 backups and all shows the same icon issue after restore.
I have already re-installed the Mustang theme and WebMan Amplifier plugin both and Cleared all cache but no success yet.

See the attached screenshots in the link below.
https://prntscr.com/f6j27i (header – icon messed up)
https://prntscr.com/f6j68v (header – icon messed up on small screen)
https://prntscr.com/f6j4jb (footer – icon messed up)

Please help.
Thank you very much
Ravi