diff --git a/src/gui/mainwindow.cpp b/src/gui/mainwindow.cpp
index 1b2f11c..bb3888a 100644
--- a/src/gui/mainwindow.cpp
+++ b/src/gui/mainwindow.cpp
@@ -207,7 +207,7 @@ bool MainWindow::eventFilter(QObject* target, QEvent* event)
         if (event->type() == QEvent::KeyPress) {
             QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
             if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
-                if (keyEvent->modifiers() & Qt::ControlModifier) {
+                if (keyEvent->modifiers() == Qt::ControlModifier) {
                     checkSellerNo(true);
                 } else {
                     checkSellerNo(false);
@@ -220,7 +220,7 @@ bool MainWindow::eventFilter(QObject* target, QEvent* event)
         if (event->type() == QEvent::KeyPress) {
             QKeyEvent* keyEvent = static_cast<QKeyEvent*>(event);
             if (keyEvent->key() == Qt::Key::Key_Enter || keyEvent->key() == Qt::Key::Key_Return) {
-                if (keyEvent->modifiers() & Qt::ControlModifier) {
+                if (keyEvent->modifiers() == Qt::ControlModifier) {
                     onPaidButtonTriggered();
                     return true;
                 }
diff --git a/src/gui/mainwindow.ui b/src/gui/mainwindow.ui
index a77a297..baca01d 100644
--- a/src/gui/mainwindow.ui
+++ b/src/gui/mainwindow.ui
@@ -112,11 +112,7 @@
             </widget>
            </item>
            <item>
-            <widget class="QDoubleSpinBox" name="givenSpinBox">
-             <property name="maximum">
-              <double>999.990000000000009</double>
-             </property>
-            </widget>
+            <widget class="QDoubleSpinBox" name="givenSpinBox"/>
            </item>
            <item>
             <widget class="QLabel" name="label_4">