I am sure that these papers were not completely removed from RG, but are still there, just no longer connected to your profile. Here are three methods to find them and to claim authorship (see also "How do I confirm authorship of my publications to add them to my profile?" in https://help.researchgate.net/hc/en-us/articles/14293005132305-How-to-add-research):
1. Openhttps://www.researchgate.net/profile/Hari-Upadhyaya-2/unconfirmed (visible only to you). There may be a list of publications for which you may claim authorship, provided these are yours.
2. Search for the titles of your missing papers at https://www.researchgate.net/search.Search.html?query=&type=publication.
3. Search for your name or for the titles of your missing papers at Google, adding site:researchgate.net, e.g.: https://www.google.com/search?q=%22Hari+D.+Upadhyaya%22+site%253Aresearchgate.net or https://www.google.com/search?q=Hari+Upadhyaya+site%253Aresearchgate.net