I merged my cousin KWCF-X3N Leah Jane East and it kicked out the initiatory and endowment and sealing to spouse.
We are not sure what you mean by merging a duplicate for your cousin "kicked out" the initiatory, endowment and sealing to spouse.
The ID for Lean Jane East that is in the tree now, KWCF-X3N, is based on her membership record. The ordinances done while she was living are there. Are you saying the initiatory, endowment and sealing to spouse were also showing as done while she was living? If they were, they should be showing, so that is a problem. But we see that her husband's were also not done while living. And she has only been deceased for one year and 3 days, so it is very unlikely those other ordinances have already been done by proxy.
The way it is right now is those ordinances can be requested, but if you are not a close living relative, which cousin would not be, you would need to get permission from a living child, undivorced spouse, parent or child to reserve those ordinances. This article explains the process:
We concur with @Dale Linda Hein's remarks, above.
However, there is yet another possible duplicate listed for Leah Jane East KWCF-X3N, which is Leah Jane East L2S4-1DX. You should merge this additional duplicate and any other possible duplicates that may yet appear in Family Tree for your cousin.
The applicable knowledge article that explains the procedure when a Church member dies is this one: https://www.familysearch.org/help/helpcenter/article/when-a-church-member-dies-does-the-church-membership-system-update-family-tree
You will note that anyone with the deceased relative in their private space will need to update that copy (in other words, mark as deceased) and then merge it with the updated copy from the membership system.