Is it weird that my mom is dating my exes father?

Is it weird that my mother has decided to go on a date with my exes dad? my ex and i were together for about 5 years and broken up 8 months ago…my mom said she swiped him on tinder and didnt recognize at first that it was him until they met in person…then they hit it off and want to see each other again…is it just me or is this weird?