When your product information suddenly changed on bol, it may be the case that another seller has changed the product information. This means that they are the owner of the product information. This is called 'brand registration'. More information about the brand registration can be found via this link. 
If your product information is not updated, it can still mean that you're not the owner of the product information and thus are not allowed to change the information. In that situation, we advise contacting bol for further assistance. Before contacting bol, please read this article which is a checklist of the must-haves for a good product synchronization, so that you can be sure that everything from your side has been performed correctly.
Finally, a little tip: check out the page that contains all the information about the specific marketplace. Sometimes there are channel-dependent details that you can check. The link to the information can be found here.