Hi,
It looks like a FOUC issue to me. This happens, when the stylesheet files are loaded via script after/during the page loading. Maybe cloudflare rocket loader is enabled or something similar. I only suggest using a stylesheet loader, if you can define the critical CSS, that needs to be inlined in the header.
If you have access to the critical CSS section, you can try adding this there:
.asp_w {
height: 0;
}It will force a 0 height on each search element, until the real CSS is loaded. It may not work though. In that case, I would suggest disabling the asynchronous CSS loading feature, if possible.