html code in notificationmail

I’ve some problems with the notification mails.

1. I got some html code in the notifications.Like <td style=" vertical-align: top; width:150px;">last name</tbody> Don’t know why this is in my notification mails.
Also with the contactinformation there’s a behind the email and a </td> behind the phonenumber.

2. I got some spaces between letters in some words. Can’t find them in the translation.

I’ve tried ” Repair database & text”
I’ve the latest wordpress version
I’ve the latest version of the booking system
I use the booking system with the Mollie payment addon.
Tested in iphone mail and in microsoft outlook. Both the same problem.

Can someone tell me how to fix this?