The problem is caused by some deprecated jQueries. You can install the “jQuery Migrate Helper” plugin and activate it.
It’s an official WP plugin made to give time to fix broken themes to work properly with WP 5.6 and later.
Unfortunately, while the developer updated the paid version they didn’t fix this. 🙁
My very same problem. 🙁
On homepage I have title and headline repeated, while on single pages just the title.
Here a couple of examples:
Home: http://www.matteoadreani.it/
<title>
Matteo Adreani | Imprenditore, Social Media & Online Reputation Specialist, SpeakerMatteo Adreani | Imprenditore, Social Media & Online Reputation Specialist, Speaker </title>
Single page: http://www.matteoadreani.it/contatti/
<title>
Contatti | Matteo AdreaniMatteo Adreani </title>
Please help!