diff --git a/CHANGELOG.md b/CHANGELOG.md
index e635912f..2ea44108 100644
--- a/CHANGELOG.md
+++ b/CHANGELOG.md
@@ -10,6 +10,7 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.1.0/).
 
 - (**Navigation**) Fix obsolete extensions being included in the updatable extensions info
 - (**Extensions**) Fix showing the uninstall button twice in the extension info page in case the extensions is obsolete and has a update at the same time
+- (**Reader**) Fix changing reader layout settings from their default value to another causing the reader to break
 
 ## [20260508.01] (r3136) - 2026-05-08
 
diff --git a/src/base/components/buttons/ButtonSelect.tsx b/src/base/components/buttons/ButtonSelect.tsx
index ced71ccb..3d6226f4 100644
--- a/src/base/components/buttons/ButtonSelect.tsx
+++ b/src/base/components/buttons/ButtonSelect.tsx
@@ -38,7 +38,7 @@ export const ButtonSelect = <Value extends string | number, MultiValue extends V
 
                 const newValue = (() => {
                     if (value === undefined) {
-                        return [displayValue];
+                        return isMultiSelect ? [displayValue] : displayValue;
                     }
 
                     if (isMultiSelect) {
diff --git a/src/features/metadata/Metadata.constants.ts b/src/features/metadata/Metadata.constants.ts
index 2089c5fb..4349eb99 100644
--- a/src/features/metadata/Metadata.constants.ts
+++ b/src/features/metadata/Metadata.constants.ts
@@ -31,6 +31,9 @@ import { detectLocale, getISOLanguage } from '@/lib/ISOLanguageUtil.ts';
 import type { I18nResourceCode } from '@/i18n';
 import { i18nResources } from '@/i18n';
 import { toUniqueLanguageCodes } from '@/base/utils/Languages.ts';
+import { assertIsDefined } from '@/base/Asserts.ts';
+
+const MATCH_ARRAY_NUMBERS = /^\[\d+(?:,\d+)*]$/g;
 
 export const APP_METADATA_KEY_PREFIX = 'webUI';
 
@@ -701,6 +704,22 @@ export const METADATA_MIGRATIONS: IMetadataMigration[] = [
         keys: [{ oldKey: 'sourceLanguages', newKey: 'browseLanguages' }],
         deleteKeys: ['sourceLanguages', 'extensionLanguages'],
     },
+    {
+        values: [
+            ...(() =>
+                ['pageScaleMode', 'readingDirection', 'readingMode', 'tapZoneLayout'].map((key) => ({
+                    key,
+                    oldValue: MATCH_ARRAY_NUMBERS,
+                    newValue: (value) => {
+                        const array = jsonSaveParse<number[]>(value);
+
+                        assertIsDefined(array);
+
+                        return JSON.stringify(array[0]);
+                    },
+                })) satisfies IMetadataMigration['values'])(),
+        ],
+    },
 ];
 
 export const ALL_APP_METADATA_KEY_PREFIXES: string[] = [