Unfortunately I misunderstood the icon on the question that Research Gate was asking me about my authorship and I removed 17 publications that belong to me.
Unfortunately, it is not possible to simply undo this action. You have to find these 17 publications in ResearchGate and claim your authorship again. First of all, look into https://www.researchgate.net/profile/Leslie-Gauna/unconfirmed (visible only to you), although it may take some time until ResearchGate's algorithm will find your publications. Then, search with Google: https://www.google.com/search?client=firefox-b-d&q=%22Leslie+Gauna%22+site%3Awww.researchgate.net#ip=1. If some publications will not be found this way, use ResearchGate's search function (https://www.researchgate.net/search.Search.html?query=&type=publication), entering each title of the missing publications.