Scheme (or CMS 5.7.4.2 itself?) not working properly

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Editing content is nearly impossible, as line spacing, font attributes and other formatting is not consistent between edit mode and user view. When switching to HTML view, identical formatting tags ar oftenly contained twice or even three times.
Sometimes after editing content and saving, the respective area suddenly is completely empty. Two developers spent hours with searching forums and trying to find solutions. I#m sorry, but we cannot use concrete5 with this theme for our project.
Purchase date was 4 days ago, I released the license from the project. Please refund, thank you!
Best regards
Steffen Richter
CEO m.objects

Type: Ticket
Status: New
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concrete5 Environment Information

concrete5 5.7.4.2, php 5.4.24, MySQL 5.6.25, all necessary extensions installed

Browser User-Agent String

Mozilla/5.0 (Windows NT 6.1; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/43.0.2357.132 Safari/537.36

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