In 1.13.2, glass blended with other glass, causing it tonot have borders around it when next to glass. But in 1.14, it has a border again and looks weird. I don't know but why has it changed? Is it a bug or a changed feature? Let's hope it's a bug, as it's weird to change it from blending glass to weird border glass again.
MC-148409
Glass doesn't blend into other glass like in 1.13.2
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i think that's because you are using OptiFine in 1.13.2, glass without borders i'ts an OptiFine feature and i'ts not in vanilla Minecraft.