Do you have two profiles now, one with your previous university address and this one with your private address? In this case your publications are probable attached to your old profile, and you should merge the two profiles (see https://help.researchgate.net/hc/en-us/articles/14292803187473 for instructions). Or did you change the address to your private one in this profile? Then it is strange why most of the publications are no longer attached. But there were other users who experienced this. See my replies to this similar questions for proposals what you can do: https://www.researchgate.net/post/Has_your_Research_Gate_profile_changed_automatically
Dear Shamala Devi K. C. Sekaran In addition to what is already pointed out by Wolfgang R. Dick your profile with 261 research items/publications can be found here https://www.researchgate.net/profile/Shamala-Sekaran