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Fixed, try:
awk '
!(a[$1]) {a[$1]=$0; next}
a[$1] {w=$1; $1=""; a[w]=a[w] $0}
END {for (i in a) print a[i]}
' FS="\t" OFS="\t" infile

try:
awk 'p!=$1{if(p)print s; p=s=$1} {sub(p,x); s=s $0} END{if(p)print s}' FS='\t' file

try:
awk '
!(a[$1]) {a[$1]=$0}
a[$1] {w=$1; $1=""; a[w]=a[w] $0}
END {for (i in a) print a[i]}
' FS="\t" OFS="\t" infile