facing character encoding issue

I am using the plugin with latest version of wordpress and php7.2

i have recently changed DB engine to MyISAM to Innodb after that i am getting this error.

?;?pwN#r9??WRD?;DMDF ;???J?,]H?h_?-?5IGr??}?0???]F?[X9?^?S?NB?a?V4??x\????L??????~???O????3?????w????+m?4?/J??S3??mOL?E?????O?,?\??????z?Hw???DJ????ij_w?L?cY??%u?Q?????me?????^xuF?O?QF|:????>?H?5#B?p??????h?H$??=??;???g???|O???6??ag?-?&I??~??mю?n?[?Q? ????X???jG?C1zu@??O#?B??@#?^??????Ya?e?^+?O)?m?"/?rfu???V?? ??F"?)7???I+(S??????N?Qt?-hRO??k?o?????gg?I { ?*g???F?????? Q????#,??*????b?h?a-?q??3??^?&?EhS?灉D%??MU???岓 ??/Q+r???? ?? G??'??2????$????<?|kP????mY<"U?????i4??? x?}??"~m?????B??a?t?)#??l4B;?=%??&ΕY?; &????{???r???Wn???????d??R*??1??fe=T?qbb???L?S?x??A?X??{8?N???#?&WQ[?i*?7?J???N*???+q?Do?C?9??07Q???dK?7???_?2uCs?b???t#???連???Ug?J?%1eY?>?iz?QYF??????Rj??L8;;>?LXD^?9??t5??Jb?? ?&?.I?3P?b??F?0n?Hi??B6????&F? ????~’6?u??eJ??mD? MR??:FU?!?dC~XJ+MJ?M?i R?x??????????p?|+???

getting error only with this plugin remaining plugins are working fine.

help me out with this issue.

Thanks