The following issue is caused by browser downscaled image rendering and didn’t relate to our theme. For better site performance and look, image sizes need to be served in correct proportions. For example, if the column has 300px width – the image placed in that column must be in close sizes for example 300-400px. In your case you placed a 1000px image (https://prnt.sc/wmn4dr) in a 222px container (https://prnt.sc/wmn2ui) – as a result this usage create almost x5 downscaling that may cause browser rendering issues.