yum check-updates | grep java doesn't show full line

[Mikmikmikmik]

Hi,
Someone please help me figure out why grep is not showing 3 out of the four full lines that have the word headless in them, that is definitely in the yum check-updates output.
Is it to do with the length of the string that the word headless is included in?

Here is the output copied and pasted.
java-1.7.0-openjdk.x86_64 1:1.7.0.261-2.6.22.2.el7_8 rhel-7-server-rpms
java-1.7.0-openjdk-devel.x86_64 1:1.7.0.261-2.6.22.2.el7_8 rhel-7-server-rpms
java-1.7.0-openjdk-headless.x86_64 1:1.7.0.261-2.6.22.2.el7_8 rhel-7-server-rpms
java-1.8.0-openjdk.x86_64 1:1.8.0.332.b09-1.el7_9 rhel-7-server-rpms
java-1.8.0-openjdk-devel.x86_64 1:1.8.0.332.b09-1.el7_9 rhel-7-server-rpms
java-1.8.0-openjdk-headless.x86_64 1:1.8.0.332.b09-1.el7_9 rhel-7-server-rpms
java-11-openjdk.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-11-openjdk-devel.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-11-openjdk-headless.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-latest-openjdk.x86_64 1:18.0.1.0.10-2.rolling.el7 epel
java-latest-openjdk-devel.x86_64 1:18.0.1.0.10-2.rolling.el7 epel
java-latest-openjdk-headless.x86_64 1:18.0.1.0.10-2.rolling.el7 epel

Here is the grep output.

# yum check-updates | grep ^java
java-1.7.0-openjdk.x86_64 1:1.7.0.261-2.6.22.2.el7_8 rhel-7-server-rpms
java-1.7.0-openjdk-devel.x86_64 1:1.7.0.261-2.6.22.2.el7_8 rhel-7-server-rpms
java-1.7.0-openjdk-headless.x86_64
java-1.8.0-openjdk.x86_64 1:1.8.0.332.b09-1.el7_9 rhel-7-server-rpms
java-1.8.0-openjdk-devel.x86_64 1:1.8.0.332.b09-1.el7_9 rhel-7-server-rpms
java-1.8.0-openjdk-headless.x86_64
java-11-openjdk.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-11-openjdk-devel.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-11-openjdk-headless.x86_64 1:11.0.15.0.9-2.el7_9 rhel-7-server-rpms
java-latest-openjdk.x86_64 1:18.0.1.0.10-2.rolling.el7 epel
java-latest-openjdk-devel.x86_64 1:18.0.1.0.10-2.rolling.el7 epel
java-latest-openjdk-headless.x86_64