Keymap inconsistency

[Muizzyranking]

In my config, i have this

win = {
          keys = {
            insertstop = { "<esc>", "stopinsert", mode = "t", desc = "enter normal mode" },
            del_word = { "<c-h>", "<c-w>", mode = { "t", "i" }, desc = "delete word" },
            c_bs = { "<c-bs>", "<c-w>", mode = { "t", "i" }, desc = "delete word" },
            c_enter = { "<c-enter>", "<c-j>", mode = { "t", "i" }, desc = "new line" },
          }
}

I want to use c-h to delete word but sometimes, it works, sometimes it doesn't and I am unable to recreate.