@Sadamali unfortunately there is not much we can help with here. The topology is built with CDP and LLDP information that is gathered by the devices and then intelligently interpreted. It appears that sometimes this isn’t too intelligent and it fails, especially where there are dual uplinks from a switch or switch stack, or a pair of MXs involved. If it’s not causing any problems, i.e. it’s just cosmetic, then don’t worry about it. If you do want to worry about it then the best I can say is to contact support and see if they can let you know what it occurring, and if there is a fix.
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