We checked your website already and everything looks fine. Logo looks fine but is smaller of course what is standard thing in sticky header. So can you explain what exactly you want to do? Because we are not sure and we have no idea if this will be possible what you ask for.
Also can you tell us in which browser you had this logo distorted in sticky header? Because we checked different browsers on different systems and it works properly on each.
Sorry but we don't see anything like that. In which browser this happen to you? Because on our screens logo only get smaller in sticky header what is normal but when we go back to top, then logo is large again. This is how sticky menu works and if you mean to have the same logo size in sticky as at the very top page, then it is just not possible.
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Also, when I scroll down and the sticky header apperas and then scroll up, the logo in header turns smaller.
Also can you tell us in which browser you had this logo distorted in sticky header? Because we checked different browsers on different systems and it works properly on each.