Regarding eval() that you quote that there is security error, actually eval() is required by Toolset. Please check the following Toolset requirement Doc:
=> https://toolset.com/toolset-requirements/
However, I will share the file you shared with our Devs and get in touch with you regarding that.
Regarding WYSIWYG editor, I see you are using an outdated WordPress version. Can you please update WordPress to latest version 5.2.2.
In addition to that, I see the following Javascript errors on your browser's console:
Uncaught ReferenceError: wptValidationForms is not defined
at (index):408
autoptimize_a4c489cb39986b5923f2b1e02b3023bf.js:1295 Uncaught SyntaxError: Invalid regular expression flags
(index):311 Uncaught TypeError: Cannot read property 'setDefaults' of undefined
at HTMLDocument.<anonymous> ((index):311)
at i (jquery.js:2)
at Object.fireWith [as resolveWith] (jquery.js:2)
at Function.ready (jquery.js:2)
at HTMLDocument.K (jquery.js:2)
recaptcha__en.js:517 reCAPTCHA couldn't find user-provided function: onLoadRecaptcha
plugin.min.js?wp-mce-4800-20180716:1 Uncaught ReferenceError: getUserSetting is not defined
at i.onPostRender (plugin.min.js?wp-mce-4800-20180716:1)
at i.a (plugin.min.js?ver=4800-20180716:1)
at jg.c.fire (tinymce.min.js?ver=4800-20180716:2)
at i.fire (theme.min.js?wp-mce-4800-20180716:1)
at i.postRender (theme.min.js?wp-mce-4800-20180716:1)
at i.postRender (theme.min.js?wp-mce-4800-20180716:1)
at i.postRender (tinymce.min.js?ver=4800-20180716:2)
at i.<anonymous> (theme.min.js?wp-mce-4800-20180716:1)
at Object.qt [as each] (tinymce.min.js?ver=4800-20180716:2)
at i.each (theme.min.js?wp-mce-4800-20180716:1)
theme.min.js?wp-mce-4800-20180716:1 Uncaught TypeError: Cannot read property 'parents' of undefined
at HTMLDivElement.u (theme.min.js?wp-mce-4800-20180716:1)
at C (tinymce.min.js?ver=4800-20180716:2)
at HTMLDivElement.d (tinymce.min.js?ver=4800-20180716:2)
theme.min.js?wp-mce-4800-20180716:1 Uncaught TypeError: Cannot read property 'parents' of undefined
at HTMLDivElement.u (theme.min.js?wp-mce-4800-20180716:1)
at C (tinymce.min.js?ver=4800-20180716:2)
at HTMLDivElement.d (tinymce.min.js?ver=4800-20180716:2)
Can you please check from where those errors are coming, you should start to investigate by following basic debug steps:
Could you please try to resolve your issue by deactivating all third-party plugins as well as the default theme to check for any possible conflicts with any of the plugins or themes?