Why are some files under `.gradle/` not ignored despite .gradle in .gitignore?

This is my .gitignore (.gradle/ in the 17th line):

# Built application files
*.apk
*.aar
*.ap_
*.aab
# Files for the ART/Dalvik VM
*.dex
# Java class files
*.class
# Generated files
bin/
gen/
out/
#  Uncomment the following line in case you need and you don't have the release build type files in your app
# release/
# Gradle files
.gradle/
build/
# Local configuration file (sdk path, etc)
local.properties
# Proguard folder generated by Eclipse
proguard/
# Log Files
*.log
# Android Studio Navigation editor temp files
.navigation/
# Android Studio captures folder
captures/
# IntelliJ
*.iml
.idea/
# .idea/workspace.xml
# .idea/tasks.xml
# .idea/gradle.xml
# .idea/assetWizardSettings.xml
# .idea/dictionaries
.idea/libraries
# Android Studio 3 in .gitignore file.
.idea/caches
.idea/modules.xml
# Comment next line if keeping position of elements in Navigation Editor is relevant for you
.idea/navEditor.xml
# Keystore files
# Uncomment the following lines if you do not want to check your keystore files in.
*.jks
*.keystore
# External native build folder generated in Android Studio 2.2 and later
.externalNativeBuild
.cxx/
# Google Services (e.g. APIs or Firebase)
google-services.json
# Freeline
freeline.py
freeline/
freeline_project_description.json
# fastlane
fastlane/report.xml
fastlane/Preview.html
fastlane/screenshots
fastlane/test_output
fastlane/readme.md
# Version control
vcs.xml
# lint
lint/intermediates/
lint/generated/
lint/outputs/
lint/tmp/
# lint/reports/
# MacOS
.DS_Store
# App Specific cases 
app/release/output.json
.idea/codeStyles/
# Android Profiling
*.hprof

Yet, when I view the list of unstaged changes, I see there some files under the .gradle/ folder:

Why aren't these files ignored like other .gradle files?

Solution

If they were already committed before adding the .gitignore you'll need to untrack them. Does Ignore files that have already been committed to a Git repository help?