Xdebug breaks on unexpected line

Hi,

I'm a PhpStorm user. I develop on a local docker container including xdebug extension. It correctly worked.

But today, it breaks on the line which I don't mark as breakpoint.

In the case above, it breaks on the line 23 first, then line 18. It surely breaks 2 times even if I marked only line 18 as breakpoint.

In this picture, it breaks on line 13, then line 17.

I updated PhpStorm, Invalidated Caches / Restarted, and rebuilt the docker image. But the situation doesn't change.

It doesn't happen on other project. But I have no idea why this is happening. Do you have any thoughts about this? thanks.

PhpStorm 2019.2.3
Build #PS-192.6817.20, built on September 25, 2019
Runtime version: 11.0.4+10-b304.69 amd64
VM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Linux 4.15.0-66-generic
GC: ParNew, ConcurrentMarkSweep
Memory: 1923M
Cores: 8
Registry: run.processes.with.pty=TRUE
Non-Bundled Plugins: Statistic, com.renemaas.intellij.zipper, de.netnexus.camelcaseplugin, ideanginx9, jp.roundrop.sqlformatter, mobi.hsz.idea.gitignore, name.kropp.intellij.makefile, net.seesharpsoft.intellij.plugins.csv, org.elixir_lang, org.intellij.RegexpTester, org.intellij.plugins.hcl, BashSupport, com.intellij.lang.jsgraphql, com.kalessil.phpStorm.phpInspectionsEA, com.pulyaevskiy.phpstorm.phpdi, de.espend.idea.laravel, de.espend.idea.php.annotation, org.jetbrains.plugins.node-remote-interpreter, fr.adrienbrault.idea.symfony2plugin, org.sylfra.idea.plugins.linessorter, org.zalando.intellij.swagger, ru.adelf.idea.dotenv

PHP: 7.3.9

xdebug: 2.8.0