Hello Pabladro,
Thank you for using support forum for the queries.
If you just wondering about the logo size, you can find the logo size codes on theme file/acmethemes/core.php and you will find the height and width of the custom-logo, you can try by changing it. You can check this link for more help.
If the problem is not solved, please let us know your site URL. We will try to find the real issue and provide you the suitable solution for that.
Please try once, we are looking forward to hearing from you again.
Regards