Minecraft Bedrock has a different way of rendering X-shaped blocks including kelp. In this case, only the plant has a symmetry unlike the top part of the kelp. This is due to the flipbook_textures.json file which displays the textures in the wrong order. They should all start with 0 in this case it is not the case (proof if below, without modification.)
Below you will find the fixed flipbook_textures.json and all the correct texture of kelp taken from Java.
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[Mod] EVGENSYPERPRO
[MOD] Greymagic27
Thank you for your report!
We're tracking this issue in https://report.bugs.mojang.com/servicedesk/customer/portal/2/MCPE-40646 , so this ticket is being resolved and linked as a duplicate.
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HARYAMC_
In fact, such an x-shaped rendering is not for all blocks. For example, pointed stone and glow berries don't have such x-shaped rendering. Also such an x-shaped rendering in bedrock is considered bug MCPE-40646. It also doesn't match the java version and doesn't look pretty.