"What shooting pattern are you using?" don't understand
Here the .RAR vith the 8 photo i use for this pano
OK - I was referring to the positioning 'pattern' of your images.
It appears you have 6-around at about -5 degrees pitch , a zenith at +90 and a nadir at -90.
That -90 nadir shot is useless and is causing the problems you report. Instead shoot the main row with a grater - pitch so that the edge of the pano head rotator is just seen at the bottom of the images. This will leave a small 'hole' at the nadir that you can handle in a variety of ways.
The relatively featureless +90 zenith shot is not incorporated in the stitch with default settings - at least not for me, I had to change detection to High. If instead you had shot one or two 'zenith' shots at about +65 pitch you would have been more likely to get good links between those zenith shots and the main row in a scene like this with a plain white ceiling and a lot of plain walls (alternatively try a complete second row of 60-around at about +50-55).
Finally you are not using a fully manual fixed exposure for all images in the image set. This is a mistake. All setting sshould be manual when shooting spherical panos like this one. Aperture and shutter speed (exposure the same for all shots), manual fixed focus and manual fixed white balance.
Screenshot 1 - on right side; first detection includes nadir shot; second detection omits nadir shot and zenith shot was omitted by stitcher; third detection without nadir shot and with detection set to High. In all cases projection set to Spherical and range set to max.
Screenshot 2 - Panorama Editor shows shooting pattern; main row with small negative pitch and +90 zenith, nadir omitted.
Screenshot 3 - shows nadir 'hole' with your shooting pattern if -90 nadir shot is omitted. This could be much smaller if you shot main row at a negative pitch where outer edge of pano head rotator just appears at the bottom of the image frame.