just have a look at your kodi-logs and search for "advancedsettings.xml". If you see something like "<delay>175</delay>", then Kodi is configured to delay the audio by 175ms. Since about 10.0.2, libreelec adds this delay as default for Intel, because 10 year old Intel SOCs needed this, but not the newer ones.
If you have a delay in your xml, then copy the advancedsettings.xml from "/usr/share/kodi/system" to "/storage/.kodi/userdata" and edit the delay from "175" to "-175". If you already have this xml in userdata, then merge the content of the system file with your file and change the delay.
Don't forget to reboot and reset the audio delay in kodi, if you have changed it in the player OSD.