Players are able to jump over stone fences when the fences change block levels. So far mobs have not been able to take advantage of this. Players are not sprinting, but able to do some sort of double jump. It is happening cross-platform with both the Xbox One and Windows 10 versions.
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We're tracking this issue in MCPE-115797, so this ticket is being resolved and linked as a duplicate.
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That is because you were standing on the lower wall, making you 0.5 blocks higher. Since you can jump 1 block and walls are 1.5 blocks high, you were able to jump over it in that case. This not a bug as far as I know.